<!DOCTYPE html>

<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>jQuery文本段落展开和折叠效果</title>
    <style>
        html,
        body,
        div,
        h2,
        p {
            margin: 0;
            padding: 0;
        }

        html {
            font: 1em Arial, Helvetica, sans-serif;
            color: #444;
        }

        a {
            color: #0087f1;
        }

        p {
            margin-bottom: 5px;
        }

        #container {
            margin: 0 auto;
            width: 600px;
        }

        #container h2 {
            font-size: 20px;
            color: #0087f1;
        }

        #wrap {
            position: relative;
            padding: 10px;
            overflow: hidden;
        }

        #gradient {
            width: 100%;
            height: 35px;
            background: url() repeat-x;
            position: absolute;
            bottom: 0;
            left: 0;
        }

        #read-more {
            padding: 5px;
            border-top: 4px double #ddd;
            background: #fff;
            color: #333;
        }

        #read-more a {
            padding-right: 22px;
            background: url() no-repeat 100% 50%;
            font-weight: bold;
            text-decoration: none;
        }

        #read-more a:hover {
            color: #000;
        }
    </style>
    <script type="text/javascript" src="js/jquery-3.6.0.js"></script>
    <script type="text/javascript">
        $(function () {
            var slideHeight = 75; // px
            var defHeight = $('#wrap').height();
            if (defHeight >= slideHeight) {
                $('#wrap').css('height', slideHeight + 'px');
                $('#read-more').append('<a href="#">点击查看更多。。</a>');
                $('#read-more a').click(function () {
                    var curHeight = $('#wrap').height();
                    if (curHeight == slideHeight) {
                        $('#wrap').animate({
                            height: defHeight
                        }, "normal");
                        $('#read-more a').html('点击隐藏');
                        $('#gradient').fadeOut();
                    } else {
                        $('#wrap').animate({
                            height: slideHeight
                        }, "normal");
                        $('#read-more a').html('点击查看更多。。');
                        $('#gradient').fadeIn();
                    }
                    return false;
                });
            }
        });
    </script>
</head>

<body>
    <div id="container">
        <h1>jQuery 控制段落文字展开折叠，点击查看更多的功能
            <h2>About Billabong</h2>
            <div id="wrap">
                <div>
                    <p>Gordon developed his own stitching technique, which made the garments more durable, cost
                        effective and less labor intensive. He employed machinists, moved the operation into a factory,
                        set up a distribution network and sponsored a team of renowned Australian surfers. The business
                        thrived.</p>
                    <p>Since those beginnings, Billabong has expanded its product range to include boardsport products
                        such as wetsuits, watches, surfboards, snowboard outerwear and skateboarding apparel.</p>
                </div>
                <div id="gradient"></div>
            </div>
            <div id="read-more"></div>
    </div>
</body>

</html>